Self-adhesive polymer modified asphalt waterproofing membrane and its preparation method

Abstract

The present invention discloses a self-adhesive polymer modified asphalt waterproofing membrane and a preparation method thereof. The waterproofing membrane comprises a base layer, the upper and lower surfaces of which are respectively covered with a modified asphalt moisture-conducting layer, the surface of which is covered with an isolation layer; the modified asphalt moisture-conducting layer is composed of an inner modified asphalt layer and an outer modified asphalt layer. The waterproofing membrane prepared by the present invention has low water absorption and good self-hydrophobicity. After long-term use, the waterproofing membrane can maintain the oil-locking ability of the impregnated base and reduce the water absorption rate of the impregnated base. With the coordinated cooperation of the inner modified asphalt layer and the outer modified asphalt layer, it can ensure that the membrane remains in a low water absorption state for a long time, thereby maintaining the stability of the material performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of waterproof rolls, and in particular relates to a self-adhesive polymer modified asphalt waterproof roll and a preparation method thereof. Background Art

[0002] Waterproofing membranes are primarily used in building walls and roofs, as well as in tunnels, highways, and landfills. They are flexible, rollable building materials that protect against rainwater and groundwater seepage. They provide a leak-proof connection between the foundation and the building, serving as the first barrier to waterproofing for the entire project and playing a crucial role. There are two main types of waterproofing membranes: asphalt waterproofing membranes and polymer waterproofing membranes.

[0003] Modified asphalt waterproofing membranes are impregnated with rubber-modified petroleum asphalt and constructed with a base made of polyester non-woven fabric, jute cloth, fiberglass mat, and other materials. They are manufactured through a series of processes, including material selection, batching, eutectic melting, impregnation, composite molding, and coiling. Asphalt waterproofing membranes are widely used for waterproofing roofs, basements, and bathrooms in industrial and residential buildings, as well as for rooftop gardens, roads, bridges, tunnels, parking lots, and swimming pools.

[0004] The impregnated base of modified asphalt waterproofing membranes is the main structure of the membrane, and the performance of the impregnated base directly determines the performance of the membrane. If the impregnated base has high water absorption and poor hydrophobicity, it will easily lead to mold and material performance degradation after long-term use, which will also limit its application in roofing or underground waterproofing projects with high waterproofing requirements. Summary of the Invention

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide a self-adhesive polymer modified asphalt waterproof membrane with low water absorption and good self-hydrophobicity and a preparation method thereof.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a self-adhesive polymer modified asphalt waterproof membrane comprises a base layer, wherein the upper and lower surfaces of the base layer are respectively covered with a modified asphalt moisture-conducting layer, and the surface of the modified asphalt moisture-conducting layer is covered with an isolation layer; the modified asphalt moisture-conducting layer comprises an inner modified asphalt layer and an outer modified asphalt layer;

[0007] The inner modified asphalt layer is composed of the following components in parts by weight: 80-110 parts of petroleum asphalt, 15-25 parts of chlorinated polyethylene resin, 5-15 parts of modified nano-silicon dioxide, 8-12 parts of silicon carbide powder, 5-9 parts of polypropylene fiber, 3-6 parts of softener, and 2-5 parts of cross-linking agent;

[0008] The outer modified asphalt layer is composed of the following components in parts by weight: 80-110 parts of base asphalt, 15-25 parts of chlorinated polyethylene resin, 5-15 parts of modified nano-silica, 5-9 parts of hollow fibers, 3-6 parts of softener, 2-5 parts of cross-linking agent, and 0.2-1 part of defoaming agent.

[0009] Preferably, the inner modified asphalt layer is composed of the following components in parts by weight: 95-100 parts of petroleum asphalt, 18-20 parts of chlorinated polyethylene resin, 8-10 parts of modified nano-silicon dioxide, 8-10 parts of silicon carbide powder, 6-8 parts of polypropylene fiber, 3-6 parts of softener, and 2-5 parts of cross-linking agent.

[0010] Preferably, the outer modified asphalt layer is composed of the following components in parts by weight: 95-100 parts of base asphalt, 18-20 parts of chlorinated polyethylene resin, 8-10 parts of modified nano-silica, 6-8 parts of hollow fibers, 3-6 parts of softener, 2-5 parts of cross-linking agent, and 0.2-1 part of defoaming agent.

[0011] Preferably, the tire base layer is a long-fiber polyester tire.

[0012] Preferably, the isolation layer is a polyethylene film or a polyvinyl chloride film.

[0013] Preferably, the softener is aromatic oil or rubber oil.

[0014] Preferably, the cross-linking agent is dicumyl peroxide.

[0015] Preferably, the defoaming agent is a silicone defoaming agent or a polyether defoaming agent.

[0016] The present invention also provides a method for preparing the self-adhesive polymer modified asphalt waterproof membrane, comprising the following steps:

[0017] S1. Heat petroleum asphalt to 130-138°C, add chlorinated polyethylene resin, modified nano-silicon dioxide, and silicon carbide powder, stir and mix for 30-40 minutes, add softener, cross-linking agent and segmented polypropylene fiber, raise the temperature to 170-180°C, stir evenly at a low speed, and keep it for 40-60 minutes to develop swelling, to obtain the inner layer modified asphalt material;

[0018] S2. Heat the base asphalt to 140-150°C, add chlorinated polyethylene resin and modified nano-silica, stir and mix for 30-40 minutes, add softener, cross-linking agent, defoamer and hollow fibers divided into segments, heat to 170-180°C, stir evenly at a low speed, and keep for 40-60 minutes to develop swelling, to obtain the outer layer modified asphalt material;

[0019] S3. Apply the inner modified asphalt material on the upper and lower surfaces of the tread base respectively to form an inner modified asphalt layer, apply the outer modified asphalt material on the surface of the inner modified asphalt layer to form an outer modified asphalt layer, cover the surface of the outer modified asphalt layer with an isolation material to form an isolation layer, cool and shape to obtain a self-adhesive polymer modified asphalt waterproof membrane.

[0020] The present invention has the following beneficial effects:

[0021] (1) The modified nano-silica is cross-linked with petroleum asphalt and chlorinated polyethylene resin under the action of a cross-linking agent to form a network structure adhesive resin. The functional groups of the modified nano-silica itself can prevent the particles from agglomerating with each other. During the cross-linking mixing process, the silicon carbide particles are evenly dispersed on the cross-linked network. The synergistic combination can improve the saturation and density of the tire base when it is impregnated with asphalt, and maintain high filling stability after long-term use, ensuring the oil locking ability of the impregnated tire base and reducing the water absorption rate of the impregnated tire base.

[0022] (2) After the polypropylene fiber swells in the inner modified asphalt layer, the capillary effect of the polypropylene fiber can quickly migrate moisture to the outer layer, and it has good unidirectional moisture conductivity; after the hollow fiber swells in the outer modified asphalt layer, the characteristics of the hollow fiber can quickly discharge moisture. At the same time, due to the super hydrophobicity of the modified nano-silica, the coordinated cooperation of the inner modified asphalt layer and the outer modified asphalt layer can ensure that the roll material remains in a low water absorption state for a long time, maintaining the stability of material performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The following drawings are intended only to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0024] Figure 1 Schematic diagram of the structure of the self-adhesive polymer modified asphalt waterproof membrane of the present invention;

[0025] In the figure: 1-tread base layer; 2-modified asphalt moisture-conducting layer; 21-inner modified asphalt layer; 22-outer modified asphalt layer; 3-isolation layer. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and examples. In the following detailed description, certain exemplary embodiments of the present invention are described by way of illustration only. It is understood that those skilled in the art will recognize that the described embodiments may be modified in various ways without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and are not intended to limit the scope of the claims.

[0027] Example 1

[0028] refer to Figure 1The self-adhesive polymer modified asphalt waterproof membrane comprises a base layer 1, which is a long-fiber polyester base layer. The upper and lower surfaces of the base layer 1 are respectively covered with a modified asphalt moisture-conducting layer 2, and the surface of the modified asphalt moisture-conducting layer 2 is covered with an isolation layer 3, which is a polyethylene film. The modified asphalt moisture-conducting layer 2 consists of an inner modified asphalt layer 21 and an outer modified asphalt layer 22.

[0029] The inner modified asphalt layer 21 is composed of the following components in parts by weight: 85 parts of petroleum asphalt, 15 parts of chlorinated polyethylene resin, 7 parts of modified nano-silicon dioxide (Hebei Mingchi Mineral Products Co., Ltd.: SF-BKT-002), 8 parts of silicon carbide powder, 5 parts of polypropylene fiber, 3 parts of rubber oil, and 2 parts of dicumyl peroxide (DCP);

[0030] The outer modified asphalt layer 22 is composed of the following components in parts by weight: 82 parts of base asphalt, 15 parts of chlorinated polyethylene resin, 6 parts of modified nano-silica (Hebei Mingchi Mineral Products Co., Ltd.: SF-BKT-002), 6 parts of hollow fiber, 3 parts of rubber oil, 2 parts of dicumyl peroxide (DCP), and 0.3 parts of silicone defoaming agent.

[0031] The preparation method comprises the following steps:

[0032] S1. Heat petroleum asphalt to 135°C, add chlorinated polyethylene resin, modified nano-silica, and silicon carbide powder, stir and mix for 30 minutes, add rubber oil, dicumyl peroxide, and segmented polypropylene fibers, raise the temperature to 175°C, stir at a low speed (150 rpm) until evenly mixed, and keep it for 40-60 minutes to develop swelling to obtain the inner layer modified asphalt material, which is then poured into the first oiling tank;

[0033] S2. Heat the base asphalt to 140°C, add chlorinated polyethylene resin and modified nano-silica, stir and mix for 40 minutes, add rubber oil, dicumyl peroxide, defoamer and hollow fibers divided into segments, raise the temperature to 175°C, stir at a low speed (speed of 150 rpm) evenly, keep it for 40-60 minutes to develop swelling, and obtain the outer layer of modified asphalt material, which is then poured into the second oiling tank;

[0034] S3. Unroll the base layer, dry it, and immerse it in the first oiling tank. After fully immersing the inner layer of modified asphalt, transfer it to the second oiling tank and fully immerse it in the outer layer of modified asphalt. Then take it out and water-cool it. Cover the isolation layer on the surface of the outer modified asphalt layer. After cooling and shaping, a self-adhesive polymer modified asphalt waterproof membrane is obtained.

[0035] Example 2

[0036] The coiled material structure and preparation method of this embodiment are the same as those of Example 1, except that: in this embodiment, the inner modified asphalt layer is composed of the following components in parts by weight: 90 parts of petroleum asphalt, 20 parts of chlorinated polyethylene resin, 9 parts of modified nano-silicon dioxide (Hebei Mingchi Mineral Products Co., Ltd.: SF-BKT-002), 9 parts of silicon carbide powder, 7 parts of polypropylene fiber, 4 parts of rubber oil, and 3 parts of dicumyl peroxide (DCP);

[0037] The outer modified asphalt layer is composed of the following components in parts by weight: 95 parts of base asphalt, 18 parts of chlorinated polyethylene resin, 8 parts of modified nano-silica (Hebei Mingchi Mineral Products Co., Ltd.: SF-BKT-002), 7 parts of hollow fiber, 3 parts of rubber oil, 2 parts of diisopropylbenzene peroxide (DCP), and 0.4 parts of silicone defoaming agent.

[0038] Example 3

[0039] The coiled material structure and preparation method of this embodiment are the same as those of Example 1, except that: in this embodiment, the inner modified asphalt layer is composed of the following components in parts by weight: 100 parts of petroleum asphalt, 23 parts of chlorinated polyethylene resin, 10 parts of modified nano-silicon dioxide (Hebei Mingchi Mineral Products Co., Ltd.: SF-BKT-002), 10 parts of silicon carbide powder, 7 parts of polypropylene fiber, 4 parts of rubber oil, and 3 parts of dicumyl peroxide (DCP);

[0040] The outer modified asphalt layer is composed of the following components in parts by weight: 100 parts of base asphalt, 18 parts of chlorinated polyethylene resin, 9 parts of modified nano-silica (Hebei Mingchi Mineral Products Co., Ltd.: SF-BKT-002), 7 parts of hollow fiber, 3 parts of rubber oil, 3 parts of diisopropylbenzene peroxide (DCP), and 0.6 parts of silicone defoaming agent.

[0041] Example 4

[0042] The coiled material structure and preparation method of this embodiment are the same as those of Example 1, except that: in this embodiment, the inner modified asphalt layer is composed of the following components in parts by weight: 100 parts of petroleum asphalt, 25 parts of chlorinated polyethylene resin, 12 parts of modified nano-silicon dioxide (Hebei Mingchi Mineral Products Co., Ltd.: SF-BKT-002), 10 parts of silicon carbide powder, 8 parts of polypropylene fiber, 4 parts of rubber oil, and 3 parts of dicumyl peroxide (DCP);

[0043] The outer modified asphalt layer is composed of the following components in parts by weight: 100 parts of base asphalt, 22 parts of chlorinated polyethylene resin, 10 parts of modified nano-silica (Hebei Mingchi Mineral Products Co., Ltd.: SF-BKT-002), 8 parts of hollow fiber, 3 parts of rubber oil, 3 parts of diisopropylbenzene peroxide (DCP), and 0.6 parts of silicone defoaming agent.

[0044] Example 5

[0045] The coiled material structure and preparation method of this embodiment are the same as those of Example 1, except that: in this embodiment, the inner modified asphalt layer is composed of the following components in parts by weight: 108 parts of petroleum asphalt, 25 parts of chlorinated polyethylene resin, 12 parts of modified nano-silicon dioxide (Hebei Mingchi Mineral Products Co., Ltd.: SF-BKT-002), 10 parts of silicon carbide powder, 8 parts of polypropylene fiber, 4 parts of rubber oil, and 3 parts of dicumyl peroxide (DCP);

[0046] The outer modified asphalt layer is composed of the following components in parts by weight: 105 parts of base asphalt, 22 parts of chlorinated polyethylene resin, 10 parts of modified nano-silica (Hebei Mingchi Mineral Products Co., Ltd.: SF-BKT-002), 8 parts of hollow fiber, 3 parts of rubber oil, 3 parts of diisopropylbenzene peroxide (DCP), and 0.6 parts of silicone defoaming agent.

[0047] Comparative Example 6

[0048] The coiled material structure and preparation method of this embodiment are the same as those of Example 1, except that: in this embodiment, the inner modified asphalt layer is composed of the following components in parts by weight: 85 parts of petroleum asphalt, 15 parts of chlorinated polyethylene resin, 7 parts of modified nano-silica (Hebei Mingchi Mineral Products Co., Ltd.: SF-BKT-002), 5 parts of polypropylene fiber, 3 parts of rubber oil, and 2 parts of dicumyl peroxide (DCP);

[0049] The outer modified asphalt layer is composed of the following components in parts by weight: 82 parts of base asphalt, 15 parts of chlorinated polyethylene resin, 6 parts of modified nano-silica (Hebei Mingchi Mineral Products Co., Ltd.: SF-BKT-002), 6 parts of hollow fiber, 3 parts of rubber oil, 2 parts of diisopropylbenzene peroxide (DCP), and 0.3 parts of silicone defoaming agent.

[0050] Comparative Example 7

[0051] The coiled material structure and preparation method of this embodiment are the same as those of Example 1, except that: in this embodiment, the inner modified asphalt layer is composed of the following components in parts by weight: 85 parts of petroleum asphalt, 15 parts of chlorinated polyethylene resin, 7 parts of modified nano-silicon dioxide (Hebei Mingchi Mineral Products Co., Ltd.: SF-BKT-002), 8 parts of silicon carbide powder, 3 parts of rubber oil, and 2 parts of dicumyl peroxide (DCP);

[0052] The outer modified asphalt layer is composed of the following components in parts by weight: 82 parts of base asphalt, 15 parts of chlorinated polyethylene resin, 6 parts of modified nano-silica (Hebei Mingchi Mineral Products Co., Ltd.: SF-BKT-002), 3 parts of rubber oil, 2 parts of dicumyl peroxide (DCP), and 0.3 parts of silicone defoaming agent.

[0053] Comparative Example 8

[0054] The coil structure and preparation method of this embodiment are the same as those of Example 1, except that: in this embodiment, 100 parts of petroleum asphalt, 23 parts of chlorinated polyethylene resin, 10 parts of modified nano-silica (Hebei Mingchi Mineral Products Co., Ltd.: SF-BKT-002), 10 parts of silicon carbide powder, 4 parts of rubber oil, and 3 parts of dicumyl peroxide (DCP) are used;

[0055] The outer modified asphalt layer is composed of the following components in parts by weight: 100 parts of base asphalt, 18 parts of chlorinated polyethylene resin, 9 parts of modified nano-silica (Hebei Mingchi Mineral Products Co., Ltd.: SF-BKT-002), 3 parts of rubber oil, 3 parts of dicumyl peroxide (DCP), and 0.6 parts of silicone defoaming agent.

[0056] Comparative Example 9

[0057] The coiled material structure and preparation method of this embodiment are the same as those of Example 1, except that: in this embodiment, the inner modified asphalt layer is composed of the following components in parts by weight: 85 parts of petroleum asphalt, 15 parts of chlorinated polyethylene resin, 7 parts of nano-silicon dioxide, 8 parts of silicon carbide powder, 5 parts of polypropylene fiber, 3 parts of rubber oil, and 2 parts of dicumyl peroxide (DCP);

[0058] The outer modified asphalt layer is composed of the following components in parts by weight: 82 parts of base asphalt, 15 parts of chlorinated polyethylene resin, 6 parts of nano-silica, 6 parts of hollow fiber, 3 parts of rubber oil, 2 parts of dicumyl peroxide (DCP), and 0.3 parts of silicone defoaming agent.

[0059] Comparative Example 10

[0060] The coiled material structure and preparation method of this embodiment are the same as those of embodiment 1, except that: in this embodiment, the inner modified asphalt layer is composed of the following components in parts by weight: 85 parts of petroleum asphalt, 15 parts of chlorinated polyethylene resin, 8 parts of silicon carbide powder, 5 parts of polypropylene fiber, 3 parts of rubber oil, and 2 parts of dicumyl peroxide (DCP);

[0061] The outer modified asphalt layer is composed of the following components in parts by weight: 82 parts of base asphalt, 15 parts of chlorinated polyethylene resin, 6 parts of hollow fiber, 3 parts of rubber oil, 2 parts of dicumyl peroxide (DCP), and 0.3 parts of organosilicon defoaming agent.

[0062] Comparative Example 11

[0063] Commercially available SBS self-adhesive modified asphalt waterproof membrane.

[0064] The waterproof membranes obtained in Examples 1-5 and Comparative Examples 6-10 were tested for performance according to the method of GB / T238.1-2007. The test results are shown in Table 1:

[0065] Table 1: Performance indicators of waterproof membranes in Examples and Comparative Examples

[0066]

[0067] In order to verify the waterproof performance and stability of the waterproof membrane in a long-term hot and humid environment, the waterproof membrane was immersed in water for a longer period of time and the ambient temperature was increased, and water absorption tests were carried out. The test results are shown in Table 2:

[0068] Table 2: Water absorption of waterproof membranes of Examples and Comparative Examples

[0069]

[0070] From the results in the above table, it can be seen that the water absorption (7d) of the waterproof membranes prepared in Examples 1-5 and Comparative Examples 6-8 are all lower than 0.03%. Comparative Example 9 replaces the modified nano-silica with nano-silica, and Comparative Example 10 does not add modified nano-silica. The water absorption (7d) of the waterproof membranes prepared in Comparative Examples 9 and 10 and the commercially available products is significantly higher than that in Example 1, indicating that the modified nano-silica can improve the saturation and density of the base layer when impregnated with asphalt material after cross-linking with petroleum asphalt and chlorinated polyethylene resin under the action of a cross-linking agent, thereby reducing the water absorption rate of the impregnated base layer.

[0071] Comparative Example 6, in which silicon carbide powder was not added to the inner modified asphalt layer, exhibited a water absorption rate (7d) lower than 0.03% compared to the waterproof membrane prepared in Example 1. However, the water absorption rate of the waterproof membrane prepared in Comparative Example 6 increased significantly with increasing immersion days and ambient temperature. This indicates that the addition of silicon carbide particles during the cross-linking mixing process can effectively improve the high filling stability of the base layer after impregnation with asphalt, ensuring the long-term oil-locking capacity of the impregnated base layer and reducing the water absorption rate of the impregnated base layer. However, after reaching a certain level, the water absorption rate of the waterproof membrane prepared in Comparative Example 6 remained relatively stable with increasing immersion days. The water absorption rates of the waterproof membrane prepared in Examples 1-5 also remained relatively stable. However, in Comparative Examples 7 and 8, which did not include polypropylene fibers and hollow fibers, the water absorption rates continued to increase with increasing immersion days. This indicates that the addition of polypropylene fibers and hollow fibers imparted excellent moisture conductivity and drainage, helping the membrane maintain a low water absorption rate over the long term, thereby maintaining material performance stability.

[0072] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A self-adhesive polymer modified asphalt waterproof membrane, including a base layer, characterized by: The upper and lower surfaces of the tire base layer are respectively covered with a modified asphalt moisture-conducting layer, and the surface of the modified asphalt moisture-conducting layer is covered with an isolation layer; The modified asphalt moisture-conducting layer consists of an inner modified asphalt layer and an outer modified asphalt layer; The inner modified asphalt layer is composed of the following components in parts by weight: 80-110 parts of petroleum asphalt, 15-25 parts of chlorinated polyethylene resin, 5-15 parts of modified nano-silicon dioxide, 8-12 parts of silicon carbide powder, 5-9 parts of polypropylene fiber, 3-6 parts of softener, and 2-5 parts of cross-linking agent; The outer modified asphalt layer is composed of the following components in parts by weight: 80-110 parts of base asphalt, 15-25 parts of chlorinated polyethylene resin, 5-15 parts of modified nano-silica, 5-9 parts of hollow fibers, 3-6 parts of softener, 2-5 parts of cross-linking agent, and 0.2-1 part of defoaming agent.

2. The self-adhesive polymer modified asphalt waterproof membrane according to claim 1, characterized in that: The inner modified asphalt layer is composed of the following components in parts by weight: 95-100 parts of petroleum asphalt, 18-20 parts of chlorinated polyethylene resin, 8-10 parts of modified nano-silicon dioxide, 8-10 parts of silicon carbide powder, 6-8 parts of polypropylene fiber, 3-6 parts of softener, and 2-5 parts of cross-linking agent.

3. The self-adhesive polymer modified asphalt waterproof membrane according to claim 1, characterized in that: The outer modified asphalt layer is composed of the following components in parts by weight: 95-100 parts of base asphalt, 18-20 parts of chlorinated polyethylene resin, 8-10 parts of modified nano-silica, 6-8 parts of hollow fibers, 3-6 parts of softener, 2-5 parts of cross-linking agent, and 0.2-1 part of defoaming agent.

4. The self-adhesive polymer modified asphalt waterproof membrane according to claim 1, characterized in that: The tire base layer is a long-fiber polyester tire.

5. The self-adhesive polymer modified asphalt waterproof membrane according to claim 1, characterized in that: The isolation layer is a polyethylene film or a polyvinyl chloride film.

6. The self-adhesive polymer modified asphalt waterproof membrane according to claim 1, characterized in that: The softener is aromatic oil or rubber oil.

7. The self-adhesive polymer modified asphalt waterproof membrane according to claim 1, characterized in that: The cross-linking agent is dicumyl peroxide.

8. The self-adhesive polymer modified asphalt waterproof membrane according to claim 1, characterized in that: The defoaming agent is an organosilicon defoaming agent or a polyether defoaming agent.

9. The method for preparing the self-adhesive polymer modified asphalt waterproof membrane according to claim 1, comprising the following steps: S1. Heat petroleum asphalt to 130-138°C, add chlorinated polyethylene resin, modified nano-silicon dioxide, and silicon carbide powder, stir and mix for 30-40 minutes, add softener, cross-linking agent and segmented polypropylene fiber, raise the temperature to 170-180°C, stir evenly at a low speed, and keep it for 40-60 minutes to develop swelling, to obtain the inner layer modified asphalt material; S2. Heat the base asphalt to 140-150°C, add chlorinated polyethylene resin and modified nano-silica, stir and mix for 30-40 minutes, add softener, cross-linking agent, defoamer and hollow fibers divided into segments, heat to 170-180°C, stir evenly at a low speed, and keep for 40-60 minutes to develop swelling, to obtain the outer layer modified asphalt material; S3. Apply the inner modified asphalt material on the upper and lower surfaces of the tread base respectively to form an inner modified asphalt layer, apply the outer modified asphalt material on the surface of the inner modified asphalt layer to form an outer modified asphalt layer, cover the surface of the outer modified asphalt layer with an isolation material to form an isolation layer, cool and shape to obtain a self-adhesive polymer modified asphalt waterproof membrane.

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